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in file DBA.php, class DBA DBA is a set of classes for handling and extending Berkeley DB style databases. It works around some of the quirks in the built-in dba functions in PHP (e.g. gdbm does not support dba_replace), has a file-based dbm engine for installations where dba support is not included in PHP.

in file Builtin.php, class DBA_Driver_Builtin DBA_Driver_Builtin uses the builtin dba functions of PHP as the underlying driver for a DBA class. Depending on the driver, this can be faster or slower than the DBA_Driver_File class.